I don't know if anyone posted about this site yet but I was able to download the 1 Mobile Market directly to the Fire and it looks and works great. Some neat stuff there. I was mostly interested in the Skyfire browser which works well. For some reason Dophin was a complete dud on my Fire. Skyfire is better. I have to say that Silk is not slow for me and I haven't found anything faster yet.

I don't know if anyone posted about this site yet but I was able to download the 1 Mobile Market directly to the Fire and it looks and works great. Some neat stuff there. I was mostly interested in the Skyfire browser which works well. For some reason Dophin was a complete dud on my Fire. Skyfire is better. I have to say that Silk is not slow for me and I haven't found anything faster yet.

Yes the fire can play music mp3 files or audible books in the background while surfing the web or other activities other than apps of course which normally take over the audio and lock u out.
as long as you can see the task bar you can do multiple things at the same time.

Yes you can. It plays in the notification bar while you do other things. It looks like your station is restricted on Tune In but they have their own Andriod app

It looks like listening to other radio stations on different apps will be available in the background with ICS unless I'm misunderstanding. I sure am anxious to be able to do so with the sports talk station I mentioned.